CN108131555B

CN108131555B - High-pressure composite container with sealing structure

Info

Publication number: CN108131555B
Application number: CN201711494393.6A
Authority: CN
Inventors: 姜林; 刘亮; 翁益明; 王祥
Original assignee: Yapp Automotive Parts Co Ltd
Current assignee: Yapp Automotive Parts Co Ltd
Priority date: 2017-12-31
Filing date: 2017-12-31
Publication date: 2023-07-25
Anticipated expiration: 2037-12-31
Also published as: CN108131555A

Abstract

The invention relates to a high-pressure composite container with a sealing structure, which comprises a plastic inner container, wherein the plastic inner container is provided with a neck part connected with the plastic inner container, and a supporting cover at least partially surrounding the plastic inner container and the neck part, the neck part is arranged in an opening area of the neck part of the container, and at least one sealing ring is arranged between the neck part and the plastic inner container; the neck part is arranged on the neck of the container in the opening area of the container after the plastic inner container is molded, and is arranged at the opening of the plastic inner container in an external assembly mode; the neck part is arranged after the plastic inner container is molded, the opening area of the container is arranged on the neck of the container, and the neck part is arranged at the opening of the plastic inner container in an external assembly mode, so that the plastic inner container is sealed relative to the neck part or the neck part relative to the plastic inner container in a complex mode, a sealing structure is designed between the plastic inner container and the neck part, and the sealing performance of the container is guaranteed.

Description

High-pressure composite container with sealing structure

Technical Field

The invention relates to a composite container, in particular to a high-pressure composite container with a sealing structure, and belongs to the technical field of oil tank structural parts.

Background

Most taxis are refitted with Compressed Natural Gas (CNG) to replace fuel oil, and the working pressure of a common CNG high-pressure gas cylinder is 20MPa; some vehicle manufacturers have promoted CNG or vehicles in which CNG is mixed with fuel, such as audi, general, etc. The hydrogen fuel cell automobile is also a current hot spot, the working pressure of the hydrogen storage high-pressure gas cylinder is generally 35MPa and 70MPa, and an IV type bottle (high-pressure plastic liner composite container) with 70MPa is a current research and development hot spot. In addition to vehicles, high-pressure gas cylinders are also used in other fields, for example, some liquefied petroleum gases in europe use plastic liner composite containers (working pressure 2 MPa). A large number of high-pressure containers are widely used in daily life, and the traditional pure metal or metal lining composite container has the problem of large weight and is not easy to transport; and the higher the storage pressure is, the more complex the production process of the metal liner is, the higher the cost is, and the risk of corrosion by high-pressure gas exists. In order to meet the light weight requirement, the high pressure plastic liner composite container is produced, and the product has the advantages of corrosion resistance, fatigue resistance and the like because of the characteristics of plastics, and the main manufacturers are Toyota, hexagon (Norway), quantum (U.S.), and the like. Compared with a pure metal or metal lining composite container, the high-pressure plastic liner composite container has more severe guarantee on tightness, and the main reason is that the plastic liner and the metal end are made of different materials, so that the connection between the plastic liner and the metal end can be loosened in the repeated use process, and the sealing performance is reduced.

In view of the current situation, the connection of the metal end and the plastic liner becomes a hot spot and a difficult point of research. Fig. 9 shows a high-pressure plastic liner composite container, in which a metal end 1 is mounted on a plastic liner 2, and then is formed by winding and wrapping a fiber composite material layer 3. Fig. 10 illustrates a sealing structure of an end face: the large-surface contact of the metal end 1 with the plastic liner is not feasible in technology, and even if the process is feasible, the cost is high; the limit on the axes of the metal end 1 and the plastic liner 2 is not considered in the structure; the structure does not consider the pressurization of the continuous change of the internal pressure of the plastic liner during winding, which can lead to the generation of gaps at the joint of the metal end 1 and the plastic liner to cause leakage; the structure does not consider the limitation of the bottleneck when bearing the installation torque, and the bonding strength of the metal end 1 and the composite layer 3 is reduced after the installation; the escape path P of the compressed gas in the structure is shorter, so that the risk of escaping the compressed gas, especially small molecular gas hydrogen and helium, can be increased; therefore, a new solution is urgently needed to solve the technical problem.

Disclosure of Invention

The invention provides a high-pressure composite container with a sealing structure, which aims at the technical problems in the prior art, and the technical scheme is ingenious in design and compact in structure, the neck part is arranged on the neck of the container after the plastic inner container is formed, and the opening area of the container is arranged at the opening of the plastic inner container in an external assembly mode, so that the plastic inner container is sealed relative to the neck part or the neck part relative to the plastic inner container in a complex mode, and the sealing structure is designed between the plastic inner container and the neck part, thereby ensuring the sealing performance of the container.

In order to achieve the above object, the present invention provides a high-pressure composite container provided with a sealing structure, characterized in that the container comprises a plastic liner having a neck part connected to the plastic liner, and a support cover at least partially surrounding the plastic liner and the neck part, the neck part being provided in an opening area of a neck of the container, and at least one sealing ring being provided between the neck part and the plastic liner; the neck part is arranged on the neck of the container in the opening area of the container after the plastic inner container is molded, and is arranged at the opening of the plastic inner container in an external assembly mode. Thus, no complicated means are required for sealing the plastic inner container relative to the neck part or the neck part relative to the plastic inner container. A sealing structure is designed between the plastic liner and the neck part, so that the sealing performance of the container is ensured. The neck part is preferably made of metal, and can be made of metal materials such as aluminum alloy, and is provided with a thread structure for connecting accessories such as a valve, so that the tightness between the neck part and the valve is ensured in a thread sealing mode, and the thread structure can be arranged on the inner side of the end of the neck part, namely an internal thread, and can also be arranged on the outer side of the end of the neck part, namely an external thread. The neck part can also be called a connecting piece or a metal end, and has a shape similar to a flange structure, and the bottom surface of the neck part is pressed on the outer surface of the plastic liner, so that the shape characteristics of the neck part and the plastic liner have correlation due to the matching relationship of the neck part and the plastic liner

As an improvement of the invention, the plastic liner of the pressure container is obtained by extrusion blow molding, after the plastic liner is shaped, the neck part is connected with the plastic liner, namely, an external mounting mode is adopted, and the two modes of welding, threaded connection and the like can be considered for the mutual connection. The plastic liner and the outer part of the neck part enclose the fiber supporting cover, so that the connection between the plastic liner and the neck part is reinforced while the strength of the container is enhanced. The pressure vessel is preferably produced by extrusion blow molding to obtain a plastic liner surrounded by a fibrous support shell of reinforcing fibers embedded in a matrix of synthetic resin. As a material for the plastic inner container 2, nylon, HDPE, PP, POM, polyester or the like is considered.

As an improvement of the present invention, the plastic liner may be considered to have a multi-layer structure, for example, the plastic liner is formed of a three-layer structure, which is an inner layer of the plastic liner, a middle barrier layer of the plastic liner, and an outer layer of the plastic liner, and the manufacturing is implemented by multi-layer co-extrusion. The fiber support housing may be constructed of carbon fiber, glass fiber, or the like. Preferably, the fiber support cover is made by winding a plastic liner with resin-impregnated fibers or filaments.

As an improvement of the invention, the plastic liner is directly assembled with the neck part, and the outer surface of the port of the plastic liner is provided with two circumferential grooves for placing the sealing ring, and the inner surface of the neck part is tightly pressed against the sealing ring to generate a certain compression amount when the sealing ring is assembled, so that a sealing effect can be formed between the neck part and the lantern ring through the sealing ring. Meanwhile, an insert is arranged on the inner side of the port of the plastic inner container, and the insert is arranged relative to the plastic inner container in an interference fit mode. It is particularly advantageous that the insert fitted inside the opening of the plastic liner and the neck member fitted outside the opening simultaneously act against the plastic liner in opposite directions, being mutually pressed, enhancing the strength of the interface and the sealing performance of the container, while the use of insert support inside can prevent the reduction of the caliber and the reduction of the sealing performance due to the compression of the plastic liner port when the neck member is fitted. The insert material is preferably made of metal, but also of plastic with a high strength and structural stability. The surface of the plastic inner container is provided with a boss, the surface of the neck part is provided with a through hole, and the boss and the through hole are matched with each other to prevent the neck part from rotating relative to the plastic inner container or the plastic inner container relative to the neck part. Threads are provided on the outside of the neck member and are used for mounting accessories such as valves and the like, and the leakage of gas in the container is prevented in a threaded sealing manner. By arranging the sealing ring between the assembling surfaces of the plastic liner and the neck part, the potential gas escape leakage path is effectively sealed, and the neck part and the liner form an effective sealing effect, namely the whole liner assembly forms an effective sealing whole.

As an improvement of the invention, the plastic liner and the neck part are connected by adopting screw threads, screw thread features are formed outside the opening when the plastic liner is blow molded, meanwhile, a groove is arranged at the bottom of the neck part, and screw threads are arranged on the side surface of the groove, so that the plastic liner and the neck part are connected by mutually matching. The inner bore of the neck member is threaded for mounting accessories such as valves. The opening surface of the plastic inner container is provided with two grooves for placing the sealing rings, the grooves are used for placing the sealing rings, and when the neck part is assembled through threads, the neck part compresses the sealing rings to enable the sealing rings to generate a certain compression amount, so that a sealing effect is formed between the neck part and the plastic inner container through the sealing rings. The sealing performance of the plastic inner container and the neck part can be greatly enhanced by the mode, and the sealing ring is arranged between the contact surfaces of the plastic inner container and the neck part, so that a potential gas escape leakage path is effectively sealed, and the neck part and the inner container form an effective sealing effect, namely the whole inner container assembly forms an effective sealing whole.

Compared with the prior art, the sealing structure of the high-pressure container has the advantages that the neck part is arranged from the outside after the plastic liner is subjected to blow molding, the connection of the neck part and the plastic liner is realized in a threaded connection or interference fit mode, the sealing ring is added between the assembling surfaces, the sealing performance of the container is enhanced, and meanwhile, the stability of the structure is enhanced by the high-strength fiber material wound outside. According to the scheme, the efficient sealing of the pressure vessel port is realized through a simple structure, the process is simplified, the production and manufacturing cost is reduced, and meanwhile, the sealing effectiveness is ensured.

Drawings

Figure 1 is a partial view of the pressure vessel of example 4,

figure 2 is a partial view of the pressure vessel of example 5,

figure 3 is a longitudinal cross-sectional view of the pressure vessel of example 4,

figure 4 is a longitudinal cross-sectional view of the pressure vessel of example 5,

FIG. 5 is a schematic view of the structure of FIG. 3 in partial cross section;

figure 6 is an enlarged view of a portion of the marked area in figure 5,

FIG. 7 is a schematic view of the partial cross-sectional structure of FIG. 4;

FIG. 8 is an enlarged view of a portion of the marked area of FIG. 7;

FIG. 9 is a schematic diagram of a prior art compression vessel;

fig. 10 is a schematic view of a prior art seal structure.

In the figure: 1. the plastic inner container comprises a pressure container body, 2, a plastic inner container body, 3, a fiber supporting cover, 4, a neck part, 5, an insert, 6, a plastic inner container inner layer, 7, a plastic inner container blocking layer, 8, a plastic inner container outer layer, 9, a sealing ring, 10, a groove, 11, external threads, 12, a boss, 13, a through hole, 14, a corner, 15, a first sealing ring, 16, a second sealing ring, 17, a first groove, 18, an internal thread, 19, a second groove, 20, a connecting thread, 21, a concave arc surface, 22, a neck part bottom surface, 23, a plastic inner container end surface, 24 and a plastic inner container end surface step.

The specific embodiment is as follows:

in order to enhance the understanding of the present invention, the present embodiment will be described in detail with reference to the accompanying drawings.

Example 1: referring to fig. 1-8, a high pressure composite container provided with a sealing structure, the container comprising a plastic liner having a neck member connected to the plastic liner, and a support cap at least partially surrounding the plastic liner and the neck member, the neck member being disposed in an open area of the neck of the container, at least one sealing ring being disposed between the neck member and the plastic liner; the neck part is arranged on the neck of the container in the opening area of the container after the plastic inner container is molded, and is arranged at the opening of the plastic inner container in an external assembly mode. Thus, no complicated means are required for sealing the plastic inner container relative to the neck part or the neck part relative to the plastic inner container. A sealing structure is designed between the plastic liner and the neck part, so that the sealing performance of the container is ensured.

Example 2: as a development of the invention, the pressure vessel 1 shown in fig. 1 and 2 of the drawings is preferably produced by extrusion blow molding to obtain a plastic liner 2, the plastic liner 2 being surrounded by a fiber support cover 3 of reinforcing fibers, the fibers being embedded in a matrix of synthetic resin. As a material for the plastic inner container 2, nylon, HDPE, PP, POM, polyester or the like is considered.

Example 3: as an improvement of the present invention, the plastic liner 2 may be considered to have a multi-layer structure, and in the embodiment shown in fig. 5, the plastic liner is formed of a three-layer structure, that is, an inner plastic liner layer 6, an intermediate plastic liner barrier layer 7, and an outer plastic liner layer 8, which are manufactured by multi-layer co-extrusion. For simplicity of illustration, in other embodiments, the plastic liner 2 is not shown as a multi-layer material structure. The fiber support cover 3 may be composed of carbon fiber, glass fiber or the like. Preferably, the fiber support cover is made by winding a plastic liner with resin-impregnated fibers or filaments.

Example 4: referring to fig. 1, 3, 5 and 6, as an improvement of the invention, the neck part 4 and the plastic liner 2 are assembled in an interference fit manner, two sealing rings 9 are arranged between the matching surfaces of the neck part and the plastic liner 2, a cylindrical insert 5 is arranged in an opening hole of the plastic liner 2, and the plastic liner 2 and the insert 5 are in interference fit. The surface of the neck part is provided with a plurality of through holes 13 which are circumferentially arranged, the outer surface near the opening of the plastic liner 2 is provided with a plurality of bosses 12, and when the plastic liner 2 and the neck part 4 are assembled, the through holes 13 are matched with the bosses 12, so that the plastic liner 2 can be prevented from relative rotation relative to the neck part 4 or the neck part 4 relative to the plastic liner. The surface of the plastic inner container 2 is provided with a circumferential corner 14, so that the surface of the plastic inner container 2 forms a step, the upper surface of the plastic inner container is attached to the surface of the plastic inner container 2 when the neck part 4 is assembled, the fiber supporting cover 3 is convenient to wind, the opening surface of the plastic inner container 2 is provided with two grooves 10 for placing the sealing rings 9, the sealing rings 9 are firstly arranged in the grooves 10 when being assembled, then the insert 5 is assembled into the opening hole of the plastic inner container 2, and finally the neck part 4 is assembled. External threads 11 are provided on the outer surface of the port of the neck member 4 for mounting accessories such as valves.

Example 5: referring to fig. 2, 4, 7 and 8, as an improvement of the present invention, in the pressure vessel of the embodiment 2 shown in fig. 7 and 8, according to the escape path of the medium molecules, the neck member 4 is assembled in a threaded manner with the plastic liner 2, and the connection is achieved by using threads 20; when the plastic liner 2 is in blow molding, the opening end face of the plastic liner is provided with a step 24, the surface of the step is provided with a first sealing ring 15, the step is provided with a second sealing ring 16, when the neck part 4 is installed, the neck part 4 can press the first sealing ring 15 and the second sealing ring 16 to form a sealing structure, and the end face of the plastic liner 2 is provided with a first groove 17 and a second groove 19 which are respectively used for placing the second sealing ring 16 and the first sealing ring 15. When the neck part 4 is assembled on the plastic liner 2, the bottom surface 22 of the neck part is overlapped with and pressed against the end surface 23 of the plastic liner, and the side surface of the port of the neck part 4 is designed into a concave cambered surface 21, so that the fiber supporting cover 3 is convenient to wind, and the reliability of the port structure of the pressure container is enhanced. An internal thread 18 is provided on the inner bore surface of the neck part 4 for mounting accessories such as valves.

The present invention also makes it possible to combine at least one of the technical features described in examples 2, 3, 4 or 5 with example 1 to form a new embodiment.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.

Claims

1. A high pressure composite container provided with a sealing structure, characterized in that the container comprises a plastic inner container, the plastic inner container is provided with a neck part connected with the plastic inner container, and a supporting cover at least partially surrounding the plastic inner container and the neck part, the neck part is arranged in an opening area of the neck part of the container, and at least one sealing ring is arranged between the neck part and the plastic inner container; the neck part is arranged on the neck of the container in the opening area of the container after the plastic liner is molded, and is arranged at the opening of the plastic liner in an external assembly mode, the neck part is assembled in a threaded connection mode with the plastic liner, and the connection is realized by utilizing threads (20); when plastic inner bag (2) blow molding, its opening terminal surface is equipped with a step (24), is equipped with a first sealing washer (15) at the step surface, is equipped with a second sealing washer (16) under the step, and when installation neck part (4), neck part (4) can compress tightly sealing washer first sealing washer (15) and second sealing washer (16) and form seal structure, when neck part (4) are assembled plastic inner bag (2), neck part bottom surface (22) and plastic inner bag terminal surface (23) coincidence and compress tightly.

2. The high-pressure composite container provided with a sealing structure according to claim 1, characterized in that the container is made of an extrusion blow-molded plastic liner surrounded by a fiber-supporting cover made of reinforcing fibers embedded in a matrix made of synthetic resin.

3. The high-pressure composite container provided with a sealing structure according to claim 2, wherein the plastic liner adopts a multi-layer structure.

4. The high-pressure composite container with the sealing structure according to claim 3, wherein the plastic liner is formed by a three-layer structure, namely an inner plastic liner layer, a middle barrier layer of the plastic liner and an outer plastic liner layer, and is manufactured by a multi-layer coextrusion mode.

5. The high-pressure composite container provided with a sealing structure according to claim 4, characterized in that a first groove (17) and a second groove (19) are provided on the end face of the plastic inner container (2) for placing a second sealing ring (16) and a first sealing ring (15), respectively.

6. The high pressure composite container provided with a sealing structure according to claim 5, wherein the port side of the neck member is designed as a concave arc surface.